condition mean min max ZT0-3 30.505799315 28.44084031 32.57075832 ZT4-7 14.2359467555 12.963094456 15.508799055 ZT8-11 7.3663514975 6.9360894575 7.796613537500001 ZT12-15 6.7676727375 6.1123956344999995 7.4229498405 ZT16-19 10.642480768750001 10.101371578 11.1835899595 ZT20-23 11.524381864999999 11.193574645 11.855189085